Author Topic: Assembly bootable calculator  (Read 6825 times)

Offline bardak

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Assembly bootable calculator
« on: June 06, 2015, 10:28:51 PM »
Hello

Im trying to make bootable calculator by using assembly. But im kind of beginner. I spent all of my day on this but altough that could not do it. I found calculator code and bootable code on the internet pages and can run them successfully one by one.

But when i try to combine them it dosent work. I really need help on this. If anyone have an idea I would like to hear that.

This is the calculator code that i use :
Code: [Select]
section .data

    ; Messages

    msg1        db      10,'-Calculator-',10,0
    lmsg1       equ     $ - msg1

    msg2        db      10,'Number 1: ',0
    lmsg2       equ     $ - msg2

    msg3        db      'Number 2: ',0
    lmsg3       equ     $ - msg3

    msg4        db      10,'1. Add',10,0
    lmsg4       equ     $ - msg4

    msg5        db      '2. Subtract',10,0
    lmsg5       equ     $ - msg5

    msg6        db      '3. Multiply',10,0
    lmsg6       equ     $ - msg6

    msg7        db      '4. Divide',10,0
    lmsg7       equ     $ - msg7

    msg8        db      'Operation: ',0
    lmsg8       equ     $ - msg8

    msg9        db      10,'Result: ',0
    lmsg9       equ     $ - msg9

    msg10       db      10,'Invalid Option',10,0
    lmsg10      equ     $ - msg10

    nlinea      db      10,10,0
    lnlinea     equ     $ - nlinea

section .bss

    ; Spaces reserved for storing the values ??provided by the user.

    opc:        resb    2
    num1:       resb    2
    num2:       resb    2
    result:     resb    2

section .text

    global _start

_start:

    ; Print on screen the message 1
    mov eax, 4
    mov ebx, 1
    mov ecx, msg1
    mov edx, lmsg1
    int 80h

    ; Print on screen the message 2
    mov eax, 4
    mov ebx, 1
    mov ecx, msg2
    mov edx, lmsg2
    int 80h

    ; We get num1 value.
    mov eax, 3
    mov ebx, 0
    mov ecx, num1
    mov edx, 2
    int 80h

    ; Print on screen the message 3
    mov eax, 4
    mov ebx, 1
    mov ecx, msg3
    mov edx, lmsg3
    int 80h

    ; We get num2 value.
    mov eax, 3
    mov ebx, 0
    mov ecx, num2
    mov edx, 2
    int 80h

    ; Print on screen the message 4
    mov eax, 4
    mov ebx, 1
    mov ecx, msg4
    mov edx, lmsg4
    int 80h

    ; Print on screen the message 5
    mov eax, 4
    mov ebx, 1
    mov ecx, msg5
    mov edx, lmsg5
    int 80h

    ; Print on screen the message 6
    mov eax, 4
    mov ebx, 1
    mov ecx, msg6
    mov edx, lmsg6
    int 80h

    ; Print on screen the message 7
    mov eax, 4
    mov ebx, 1
    mov ecx, msg7
    mov edx, lmsg7
    int 80h

    ; Print on screen the message 8
    mov eax, 4
    mov ebx, 1
    mov ecx, msg8
    mov edx, lmsg8
    int 80h

    ; We get the option selected.
    mov ebx,0
    mov ecx,opc
    mov edx,2
    mov eax,3
    int 80h

    mov ah, [opc]       ; Move the selected option to the registry ah
    sub ah, '0'     ; Convert from ascii to decimal

    ; We compare the value entered by the user to know what operation to perform.

    cmp ah, 1
    je add
    cmp ah, 2
    je subtract
    cmp ah, 3
    je multiply
    cmp ah, 4
    je divide

    ; If the value entered by the user does not meet any of the above
    ; conditions then we show an error message and we close the program.
    mov eax, 4
    mov ebx, 1
    mov ecx, msg10
    mov edx, lmsg10
    int 80h

    jmp exit

add:
    ; We keep the numbers in the registers al and bl
    mov al, [num1]
    mov bl, [num2]

    ; Convert from ascii to decimal
    sub al, '0'
    sub bl, '0'

    ; Add
    add al, bl

    ; Conversion from decimal to ascii
    add al, '0'

    ; We move the result
    mov [result], al

    ; Print on screen the message 9
    mov eax, 4
    mov ebx, 1
    mov ecx, msg9
    mov edx, lmsg9
    int 80h

    ; Print on screen the result
    mov eax, 4
    mov ebx, 1
    mov ecx, result
    mov edx, 2
    int 80h

    ; We end the program
    jmp exit

subtract:
    ; We keep the numbers in the registers al and bl
    mov al, [num1]
    mov bl, [num2]

    ; Convert from ascii to decimal
    sub al, '0'
    sub bl, '0'

    ; Subtract
    sub al, bl

    ; Conversion from decimal to ascii
    add al, '0'

    ; We move the result
    mov [result], al

    ; Print on screen the message 9
    mov eax, 4
    mov ebx, 1
    mov ecx, msg9
    mov edx, lmsg9
    int 80h

    ; Print on screen the result
    mov eax, 4
    mov ebx, 1
    mov ecx, result
    mov edx, 1
    int 80h

    ; We end the program
    jmp exit

multiply:

    ; We store the numbers in registers al and bl
    mov al, [num1]
    mov bl, [num2]

    ; Convert from ascii to decimal
    sub al, '0'
    sub bl, '0'

    ; Multiply. AX = AL x BL
    mul bl

    ; Conversion from decimal to ascii
    add ax, '0'

    ; We move the result
    mov [result], ax

    ; Print on screen the message 9
    mov eax, 4
    mov ebx, 1
    mov ecx, msg9
    mov edx, lmsg9
    int 80h

    ; Print on screen the result
    mov eax, 4
    mov ebx, 1
    mov ecx, result
    mov edx, 1
    int 80h

    ; We end the program
    jmp exit

divide:

    ; We store the numbers in registers ax and bx
    mov al, [num1]
    mov bl, [num2]

    mov dx, 0
    mov ah, 0

    ; Convert from ascii to decimall
    sub al, '0'
    sub bl, '0'

    ; Division. AL = AX / BX
    div bl

    ; Conversion from decimal to ascii
    add ax, '0'
    ; We move the result
    mov [result], ax

    ; Print on screen the message 9
    mov eax, 4
    mov ebx, 1
    mov ecx, msg9
    mov edx, lmsg9
    int 80h

    ; Print on screen the result
    mov eax, 4
    mov ebx, 1
    mov ecx, result
    mov edx, 1
    int 80h

    ; We end the program
    jmp exit

exit:
    ; Print on screen two new lines
    mov eax, 4
    mov ebx, 1
    mov ecx, nlinea
    mov edx, lnlinea
    int 80h
    ; End the program
    mov eax, 1
    mov ebx, 0
    int 80h

and this one for creating bootable disc:
Code: [Select]
[BITS 16] ;tell the assembler that its a 16 bit code
[ORG 0x7C00] ;Origin, tell the assembler that where the code will
;be in memory after it is been loaded

JMP $ ;infinite loop

TIMES 510 - ($ - $$) db 0 ;fill the rest of sector with 0
DW 0xAA55 ; add boot signature at the end of bootloader

How should i combine them together?
« Last Edit: June 06, 2015, 10:47:15 PM by bardak »

Offline Frank Kotler

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  • Posts: 2667
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Re: Assembly bootable calculator
« Reply #1 on: June 07, 2015, 08:59:43 AM »
Just swap your bootloader for one that boots Linux and you're all set!

Seriously, bardak, your calculator code is for Linux, and is not very suitable as a starting point for a bootable calculator. Since you've got it you might want to test it a little more. I think you'll find that its abilities are pretty limited. If you're going to go to the bother of making it bootable, write a new one. If you write it for dos, as a "dosless .com file" (using BIOS interrupts), it'll be easy to make it bootable.

Generally, the only thing for a bootsector to do is load something else. It might make an interesting challenge to see how good a calculator you could squeeze into 512 bytes (less required housekeeping). I probably won't get into the mood to play with it... but it's interesting...

Failing that, we can discuss how to load something else with your bootloader and jump to it. Could be anything - a whole OS or just a calculator. Whatever it is will have to start with appropriate code - 16-bit real mode, but you can go on from there if you want to... Happy bootin'!

Best,
Frank